The X command can be used to set a variety of options.  If no argument is
given, X simply toggles and displays the new Expert status. 

     If a number is given after X, this is the number of lines to display
for a command before asking More? To continue displaying the current
message when More? is sent press return. To abort the message, type N and
then return. This facility has been added to prevent a long message from
scrolling off your screen faster than you can read it. Experiment with
different values until you find one that pleases you. 
To not use this facility, set the number of lines to zero. Examples:
X 20  (pause after every 20 lines)       X 0  (don't pause ever)

XF     Set "fast" mode: BBS will put more than one line per packet
XS     Set "slow" mode: BBS will put only one line per packet.
Note: If you have very good path to bbs, use XF. If you have a poor
path to bbs, use XS since short packets make it through easier.

XC toggles the automatic display of msg catagories when you connect to the
bbs and are using non-expert mode.

XR toggles the automatic asking if you want to reply to a msg after you read 
it. Can be useful if you get a lot of personal mail.

XU toggles the automatic display of Unread mail when you connect. 
